#include <iostream>

using namespace std;

int main(int argc, char *argv[])
{
    char str_t[16] = "hello world";
    cout << "-- hello world --" << endl;
    cout << str_t << endl;
    //cout << ((1 <=> 0) > 0) << endl;// c++20 新特性 "std=c++20"
}

